Without a doubt a custom remap by MRC tuning. Speak to Mihnea or Doug. Mihnea has built a reputation for tuning Audi's (particularly S2's) They have a couple at around 480bhp. My S4 avant is now pushing 324bhp and 375il/ft torque after Mihnea's magic. www.mrctuning.com
Also look on www.rs246.com as there are loads of threads on there covering this subject.
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